YAML Validator

Online tool for checking YAML syntax with error line and column hints.

Обработка выполняется локально в браузере. Данные не отправляются на сервер.

For this tool, processing runs locally in your browser and data is not sent to the server.

YAML Validator is a free online tool for checking YAML syntax in configs, Kubernetes manifests, Docker Compose, and CI/CD files. Processing runs locally in your browser.

What it does

Output

Processing

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How to use

Paste a YAML config, Kubernetes manifest, Docker Compose, GitHub Actions, GitLab CI, or other YAML fragment.
Choose check mode: standard YAML or simplified mode for fragments.
Check status: YAML is valid or contains an error.
If there is an error, review the message, line, column, and fragment near the problem.

More about this tool

YAML Validator checks YAML syntax and helps quickly find errors in configs, Kubernetes manifests, Docker Compose, GitHub Actions, GitLab CI, CI/CD files, or dev settings.

The tool shows validity status, error message, line, column, and a fragment near the problem. For valid YAML it shows basic structure stats: lines, keys, arrays, maximum depth, root type, and size.

The validator checks YAML syntax only, not specialized schema validation for Kubernetes, Docker Compose, or CI/CD.

Processing runs locally in your browser.

Checks YAML syntax
Shows validity status
Helps locate error line and column
Warns about tabs and trailing spaces
Suitable for Kubernetes, Docker Compose, and CI/CD files
Runs in the browser
Data is not sent to the server
No registration required

Frequently Asked Questions

What does the YAML validator do?

It checks whether YAML can be read by a parser and shows status: valid or syntax error.

Does the validator show where the error is?

Yes. If the parser returns a position, the tool shows the error message, line, column, and a nearby fragment.

Why does YAML often break because of indentation?

In YAML, indentation defines nesting. An extra space, wrong level, or tabs instead of spaces can make structure invalid.

Can I use tabs in YAML?

Spaces are preferred for YAML indentation. The tool may warn about tabs at the start of lines.

Does the service validate Kubernetes manifests?

The service checks YAML syntax, not Kubernetes schema. YAML can be valid but still incorrect for Kubernetes.

Is the validator suitable for GitHub Actions and GitLab CI?

Yes, for basic YAML syntax check. Platform workflow or pipeline correctness needs specialized validators.

How is the YAML validator different from the YAML formatter?

The validator shows whether there is a syntax error and where. The formatter prettifies valid YAML with chosen indentation.

Does the validator fix YAML automatically?

No. The tool shows errors and hints but should not automatically change the config, to avoid distorting structure.

Is my data sent to the server?

No. Processing runs locally in your browser and data is not sent to the server.

Do I need to register?

No. The tool works without registration.

How to use

Paste a YAML config, Kubernetes manifest, Docker Compose, GitHub Actions, GitLab CI, or other YAML fragment.

Choose check mode: standard YAML or simplified mode for fragments.

Check status: YAML is valid or contains an error.

If there is an error, review the message, line, column, and fragment near the problem.

More about this tool

YAML Validator checks YAML syntax and helps quickly find errors in configs, Kubernetes manifests, Docker Compose, GitHub Actions, GitLab CI, CI/CD files, or dev settings.

The tool shows validity status, error message, line, column, and a fragment near the problem. For valid YAML it shows basic structure stats: lines, keys, arrays, maximum depth, root type, and size.

The validator checks YAML syntax only, not specialized schema validation for Kubernetes, Docker Compose, or CI/CD.

Processing runs locally in your browser.

Checks YAML syntax
Shows validity status
Helps locate error line and column
Warns about tabs and trailing spaces
Suitable for Kubernetes, Docker Compose, and CI/CD files
Runs in the browser
Data is not sent to the server
No registration required

Frequently Asked Questions

What does the YAML validator do?

It checks whether YAML can be read by a parser and shows status: valid or syntax error.

Does the validator show where the error is?

Yes. If the parser returns a position, the tool shows the error message, line, column, and a nearby fragment.

Why does YAML often break because of indentation?

In YAML, indentation defines nesting. An extra space, wrong level, or tabs instead of spaces can make structure invalid.

Can I use tabs in YAML?

Spaces are preferred for YAML indentation. The tool may warn about tabs at the start of lines.

Does the service validate Kubernetes manifests?

The service checks YAML syntax, not Kubernetes schema. YAML can be valid but still incorrect for Kubernetes.

Is the validator suitable for GitHub Actions and GitLab CI?

Yes, for basic YAML syntax check. Platform workflow or pipeline correctness needs specialized validators.

How is the YAML validator different from the YAML formatter?

The validator shows whether there is a syntax error and where. The formatter prettifies valid YAML with chosen indentation.

Does the validator fix YAML automatically?

No. The tool shows errors and hints but should not automatically change the config, to avoid distorting structure.

Is my data sent to the server?

No. Processing runs locally in your browser and data is not sent to the server.

Do I need to register?

No. The tool works without registration.